Rotary brush core construction with integral tangs

ABSTRACT

A core construction for a brush roll means formed from a blank of sheet stock material and providing integral tang means on the blank for securement of opposite ends of a brush strip member.

United States Patent Inventor Donald E. Scruggs Chino, Calif.

Appl. No. 57,569

Filed July 23, 1970 Patented Jan. 11, 1972 Assignee Industrial BrushCompany Pomona, Calif.

ROTARY BRUSH CORE CONSTRUCTION WITH INTEGRAL TANGS 9 Claims, 6 DrawingFigs.

US. Cl 15/182, 300/21 Int. Cl A46b 3/16 Field of Search 29/1 80,

[56] References Cited UNITED STATES PATENTS 2,281,412 4/1942 Cave et a1.15/182 2,651,799 9/1953 Lombardi.... 15/182 X 2,379,205 6/1945Wesemeyer. 15/182 2,609,559 9/1952 Peterson 15/182 3,042,951 7/1962Ti1gner..... 15/182 3,107,381 10/1963 Ti1gner 15/182 Primary Examiner-Peter Feldman AnarneyMiketta, Glenny, Poms and Smith ABSTRACT: A coreconstruction for a brush roll means formed from a blank of sheet stockmaterial and providing integral tang means on the blank for securementof opposite ends ofa brush strip member.

PATENIED Jun I 372.

INVENTOE. fia/mLa E SCEUGGJ flu, 3 Jazz.

firm/wary;

BACKGROUND OF THE INVENTION In brush roll means utilizing a cylindricalcore surface upon which a brush strip member, having a U-section basemember and filaments retained and extending outwardly from the basemember, is helically wound, various prior proposed means have been usedto secure the brush strip member to the core member for the purpose ofpreventing relative movement between the brush strip member and thecylindrical core surface. Such relative movement was sometimescharacterized by the formation of radially outwardly displaced bulges ofthe brush strip member where the turns of the helically wound memberbecame loose and were not in tight frictional engagement with the coresurface and also when circumferential displacement or creeping of thehelically wound brush strip member occurred because of the forces actingupon the brush filaments which were transmitted to the brush stripmember during rotation of the brush roll. Such loosening and relativemovement of the brush strip member with respect to the core member couldproduce a dynamic unbalance in the brush roll which would increase wearon the brush and the brush driving means, and which would decrease theworking efficiency of the brush roll on the surface being brushed. Insome instances, vibration of the brush strip under such loose conditionswould cause breakage of the strip.

Some prior proposed securement means included a tang member clamped onthe end of the brush strip member and then secured by various means,such as a cable, to the core structure (see U.S. Pat. No. 3,193,866).Other securement arrangements included welding, riveting, or drivescrewing a tang member to a core member or using J-bolts in which the J-shaped end of such a bolt overlay and received the brush strip member.In another prior proposed securement arrangement, an annular ring wasprovided with teeth lying in a plane passing longitudinally through theaxis of the core and positioned to overlie and bear against the outerperipheral edges of the brush strip member, see U.S. Pat. No. 2,609,559.

In each of the prior proposed securement means for the end of a brushstrip member, one or more intermediary elements were employed to securethe brush strip end to the core and required additional separateassembly steps; thereby increasin g cost and expense of material andlabor. In operation of the brush roll means, such intermediary elementsoften became loose, required adjustment, and resulted in equipment losttime.

SUMMARY OF THE INVENTION The present invention contemplates a novel coreconstruc tion which avoids the disadvantages of the prior proposedsecurement arrangements for ends of a brush strip member on a coremember. The invention relates to a core member provided with a novelconstruction of integral tang means and a plurality of brush roll meansof relatively short length and embodying the novel core construction.

A main object of the present invention is to disclose a novel coreconstruction having integral tang means for securing opposite ends of abrush strip member coiled thereupon.

Another object of the present invention is to disclose a blank of sheetmetal stock material which may be stamped for providing a core memberwith integral tang means.

Another object of the present invention is to disclose a novel coremember for a brush roll means wherein the tang means thereon areselectively referenced to a core member supporting mandrel or shaft. 7

A still further object of the present invention is to disclose andprovide a core member which is capable of being inexpensively andrapidly manufactured.

Other advantages and objects of the present invention will be readilyapparent from the following description of the drawings in whichexemplary embodiments of the invention are shown.

IN THE DRAWINGS FIG. 1 is a broken fragmentary view of a sheet metalblank stamped to provide a core member embodying the present invention,the other side of said blank being identical to the side shown;

FIG. 2 is a side elevational view of a core member embodying theinvention, the view being partly in section to show the partition wallconstruction;

FIG. 3 is an end view taken from the plane indicated by line III-III ofFIG. 2;

FIG. 4 is an exploded perspective view of three core members arranged ona mandrel shaft to illustrate the angular displacement of each coremember with respect to the other for continuous winding of a brush stripmember on said core members;

FIG. Sis a schematic side elevational view of two core members with abrush strip member represented thereon and partially wound on one of thecore members; and

FIG. 6 is a fragmentary enlarged sectional view taken in the planeindicated by line VIVI of FIG. 5.

Referring first to FIG. 1, there is shown a blank generally indicated at10 of sheet metal stock of any suitable gauge or thickness.Approximately a longitudinal half of blank 10 is shown, the otherlongitudinal half being similarly configured and is not shown forpurposes of brevity.

Blank 10 comprises an intermediate blank portion 11 of uniform width andextending between end portions 12 and 14, said end portions terminatingin transverse end edges 15 and 16.

Tang means may be stamped from each end portion 12 and 14 at side edgesof the end portions. Tangs or tang teeth 18 stamped from end portion 12include tang points 19 which lie along a line in prolongation of sideedge 20 of intermediate portion 11. Tang teeth cavities 21 lie generallyslightly inwardly of a longitudinal side fold line 22 about which sidemargins 23 of the intermediate portion are infolded as shown in FIG. 2to reinforce ends of the completed formed core member generallyindicated at 25, FIG. 2. In this example, the number of tang teeth 18formed in end portion 12 may be three.

Opposite end portion 14 may be stamped with tang means comprising a pairof tangs 26 having tang points 27 lying approximately on the projectionof a longitudinal line passing through the middle portion of tangs 18 atthe opposite end, said line being identified at 28. Tang teeth cavities29 generally extend inwardly a distance from side edge 20 less thantwice the width of side margins 23 as shown in FIG. 2. Tangs 26 in thisexample comprise two tang teeth and are offset inwardly or inboardly ofthe tang teeth 18 at the opposite end of the blank.

Blank 10 is provided with a selected length depending upon the diameterof the core member 25 to be formed so that when the blank 10 is rolledinto cylindrical form, end portion 14 may overlap end portion 12 in suchmanner that when the tangs l8 and 26 are bent radially outwardly andoutstanding, the tang points 27 will lie opposite and transverse to thetang cavities 21 on the outer tang teeth 18. Thus as best shown in FIG.2, overlapping of end portion 14 with respect to end portion 12 and withupstanding teeth 18 and 26 in juxtaposed relation, recesses 30 areformed by the tangs 18 and 26 for reception of ends of a brush stripmember 32.

Core member 25 may also include a centrally positioned transversestiffening or reinforcing partition wall 34 of circular form and havingperipheral axially extending flange means 35 secured to the innersurface of intermediate portion 11 as by suitable means such as spacedspot welding indicated at 36. Partition wall 34 includes an axiallyaligned polygonal, or in this example, hexagonal opening 37, one of thevertices 38 lying on a diameter 39 which passes through center tangtooth 18 of the outer tang means. The partition wall 34 and theparticular polygonal opening 37 is thus referenced in its position tothe tang means carried by the core member for a purpose later described.

It will thus be apparent that core member 25 is reinforced in itscylindrical shape by partition wall 34 and the overfolded end margins 23and the overlapping ofend portions 14 and 12, said end portions beingsecured as by spaced spot welding 40 and provides a rigid core member ofselected length provided with integral tang means for securing a brushstrip member.

Wall 34 may also include a plurality of spaced holes 38 for mounting ahub (not shown) on the core member for attachment of core member to abrush driving shaft (not shown) in well-known manner.

Brush strip member 32 may be of well-known form and generally comprisesa brush strip U-section or channel formed base member 42 provided with awire retainer member 43 for securing a plurality of suitable brushfilaments 44 within the base member 42 in well-known manner. Brush stripmember 32 may be coiled or wound on a core member 25 in a manner nowdescribed.

In FIGS. 4 and 5, a plurality of core members 25 are shown in coaxialrelation. When assembling such a plurality of core members on a mandrelfor winding thereon of a brush strip member 32, a mandrel shaft 46 ofcorresponding polygonal shape is passed through the hexagonal opening 37in the partition walls of the core members. Since the vertices 38 ineach partition wall 34 is in registration with the tang means, each coremember 25 may be positioned on mandrel shaft 46 with the tang means in120 spaced relation from the tang means on the adjacent core member. Thespacing of 120 is related to the lead of the brush strip member 32 to becoiled in a helical fashion on the core members.

In addition to angular spacing of the successive core members 25, spacermembers 55 may be interposed between adjacent ends of the core members25 to accommodate the selected pitch of helical coil. Each member 55 mayinclude a pair of peripherally flanged circular walls 56 similar to wall34, arranged with flanges 57 facing each other and provided withcorresponding polygonal openings 58 to receive the mandrel shaft. Atcircularly spaced intervals, radially outwardly directed pins 59 aresecured as by welding to the flange edges. The flanges 57 are receivablewithin open ends of the core members to support ends of the core membersduring the coiling operation and to prevent tilt of the cores about wall34. The pins 59 of selected size serve to axially space the core membersin accordance with the selected pitch ofthe coil.

Thus as illustrated in FIG. 5, a brush strip member 32 may be started atone end of the plurality of core members 25 as indicated at 47 and theend thereof secured by bending over the points 19 and 27 of the tangmeans. As the core members are rotated by the mandrel shaft 46 throughsuitable driving means (not shown) and advanced axially from the pointof feed of the brush strip 32, the brush strip is wound tightly andsnugly on the cylindrical surface of the core member 25. When the brushstrip 32 reaches the opposite end of the first core member 25, the leadof the helix being wound causes the brush strip member to pass into thetang recess 30 and between the tang teeth 18 and 26.

The brush strip 32 is thus received in successive tang recesses inadjacent core members without interruption of the winding operation.After the brush strip member 32 has been continuously wound over theplurality of core members 25 and the winding stopped, tang teeth 18 and26 at each tang recess may be bent over as by hammering (FIG. 6) tofirmly secure the brush strip member on the core members. Spacer members55 provide a support and backup for the hammering operation since thespacer walls 56 will be positioned substantially beneath the tang means.

It will be understood that the method of winding brush strip member 32on core members 25 may include the method described in US. Letters Pat.No. 3,193,865.

The core members 25 and the rotary brush means thereby formed may bereadily separated from each other by cutting the brush strip member atends of the core members as at 50 and intermediate and approximatelycentrally between the tang means on the adjacent core members. Spacermembers 55 support the ends of the core members during the cutting andresist deformation of the core end. An arcuate brush strip tail 51 isthereby formed which extends beyond the tang means of core member 25 andin this example subtends an angle of approximately 60. After cutting,during which tail 51 may be slightly bent from its original curvedposition, the tail 51 may be reshaped into conformity with thecylindrical surface of the core member 25 In the event a rotary brushrequires positioning of core members 25 in adjacent relation, it will bereadily apparent that the end faces of tails 51 may approximately abuteach other when the core members are positioned coaxially adjacent eachother and angularly displaced Thus in such instance, complete continuityof a rotary brush means is provided. It has been found that the lengthof tail 51 is sufficiently stiff or dimensionally stable so as tomaintain its position with relation to the core 25 during operativerotation of the brush means.

In the present example of the invention in which blank 10 is formed of arectangular blank of sheet stock, it will be readily apparent that theends of the formed core member 25 will lie in a plane normal to the axisof the core member 25. The invention also contemplates that a blank ofsheet stock material may be provided of nonrectangular form, such as aparallelogram configuration whereby the end portions are overlappedalong ajoint line or means generally parallel to the axis of the coremember and in which the ends of the core member may be of helicalconfiguration corresponding to the lead of the brush strip coil. In thisexample, the tang means of adjacent cores may be positioned inapproximate contiguous relation so that continuity of winding of thebrush strip member upon a plurality of cores may be accomplished andcontinuity of rotary brush means so formed may also be provided. Suchconstruction obviates a tail 51 of substantial length.

It will be understood that blank 10 may be stamped of slightly differentconfiguration in order to provide integral tangs while minimizing wastematerial and facilitating rapid production of a plurality of coremembers. The overlapping and securement by spot welding of end portions12 and 14 of blank 10 provides a joint means at which the tang means arelocated and readily formed, however it will be understood that the jointmeans may be other than parallel to the longitudinal axis of the coremember, that the end edges 15 and 16 may be cut upon a bias so that thetang means at opposite ends of the core member may be angularly offsetfrom one another depending upon preselected lead and pitch of the brushstrip member which is to be wound upon the core member.

It will be understood that while the exemplary illustration of theinvention shows a core member having tangs arranged for a tight brushstrip coil of selected pitch, the tangs may be punched from the coreblank to accommodate a coil of very loose or long pitch or lead. Forexample, in some vacuum cleaner brushes, the coil strip may completeonly one turn in the length ofthe core.

Thus, the present invention contemplates various variations in the shapeof the blank means 10 which may result in integral tang means beinglocated and positioned other than directly longitudinally opposite asillustrated in the present example. All such changes and modificationswhich come within the scope of the appended claims are embraced thereby.

Iclaim:

l. A blank of sheet metal stock provided with integral tang means andfor forming a brush core to support a brush strip member coiled thereon,comprising:

said blank of sheet metal stock having end portions and an intermediateportion of uniform width between said end portions;

each end portion being provided with outwardly directed tangs at sideedges thereof;

the tangs at one end portion being spaced inwardly from the tangs at theother end portion,

whereby overlapping and securing said end portions while forming saidblank into cylindrical shape and radially outwardly bending said tangsprovides tang recesses at opposite ends of the cylindrical shape forreception of ends of a brush strip member coiled about said cylindricalshape. 2. A blank as stated in claim 1 wherein a selected number oftangs are provided at said one end portion and one or more tangs isprovided at said other end portion, said tangs at said one end portionbeing positioned out of transverse alignment with said tangs on saidother end portion when said blank is formed into cylindrical shape. 3.in a blank as stated in claim 1 wherein side edge margins of saidintermediate portion are overfolded to reinforce ends of saidcylindrical shape circumferentially between said tangs which areradially outwardly bent.

4. In a core construction for a rotary brush the combination of:

a cylindrical core member of sheet metal stock material defining alongitudinal axis; said core member havingjoint means; a set of tangmeans integral with said core member at said joint means and lying in aplane transverse to said axis; said set of tang means including aplurality of tang teeth integral with said core member and at the endedge of the core member, and a plurality of tang teeth inboardly of theedge tang teeth and integral with the core member, said set of tangmeans providing a tang recess to receive and secure a brush strip memberto said core member. 5. In a core construction as stated in claim 4wherein said joint means includes overlapping end portions of sheetstock material forming said core member; and

said tang means are integrally formed with said end portions.

6. In a core construction as stated in claim 4 including a transversepartition wall secured within said core member between its ends,

said partition having a means for nonrotational reception of a shaft,

said nonrotational means being referenced to one of said tang means.

7. In a core construction as stated in claim 4 wherein said tang meansat said joint means are longitudinally opposite and aligned.

8. [n a rotary brush construction including a brush strip member woundin a helical coil, the combination of:

a cylindrical core member of selected length;

said core member having at each end an integrally formed outstanding setof oppositely directed, axially spaced tang teeth providing a recess toreceive an end of said brush strip member and to secure said brush stripmember on said core.

9. In a rotary brush construction including a brush strip member woundin a helical path, the combination of:

a cylindrical core member formed out of a core blank;

said core blank including integral sets of tang teeth formed thereinadjacent to ends of the blank, each set of tang teeth including teethformed inboardly of the other teeth of the set.

1. A blank of sheet metal stock provided with integral tang means andfor forming a brush core to support a brush strip member coiled thereon,comprising: said blank of sheet metal stock having end portions and anintermediate portion of uniform width between said end portions; eachend portion being provided with outwardly directed tangs at side edgesthereof; the tangs at one end portion being spaced inwardly from thetangs at the other end portion, whereby overlapping and securing saidend portions while forming said blank into cylindrical shape andradially outwardly bending said tangs provides tang recesses at oppositeends of the cylindrical shape for reception of ends of a brush stripmember coiled about said cylindrical shape.
 2. A blank as stated inclaim 1 wherein a selected number of tangs are provided at said one endportion and one or more tangs is provided at said other end portion,said tangs at said one end portion being positioned out of transversealignment with said tangs on said other end portion when said blank isformed into cylindrical shape.
 3. In a blank as stated in claim 1wherein side edge margins of said intermediate portion are overfolded toreinforce ends of said cylindrical shape circumferentially between saidtangs which are radially outwardly bent.
 4. In a core construction for arotary brush the combination of: a cylindrical core member of sheetmetal stock material defining a longitudinal axis; said core memberhaving joint means; a set of tang means integral with said core memberat said joint means and lying in a plane transverse to said axis; saidset of tang means including a plurality of tang teeth integral with saidcore member and at the end edge of the core member, and a plurality oftang teeth inboardly of the edge tang teeth and integral with the coremember, said set of tang means providing a tang recess to receive andsecure a brush strip member to said core member.
 5. In a coreconstruction as stated in claim 4 wherein said joint means includesoverlapping end portions of sheet stock material forming said coremember; and said tang means are integrally formed with said endportions.
 6. In a core construction as stated in claim 4 including atransverse partition wall secured within said core member between itsends, said partition having a means for nonrotational reception of ashaft, said nonrotational means being referenced to one of said tangmeans.
 7. In a core construction as stated in claim 4 wherein said tangmeans at said joint means are longitudinally opposite and aligned.
 8. Ina rotary brush construction including a brush strip member wound in ahelical coil, the combination of: a cylindrical core member of selectedlength; said core member having at each end an integrally formedoutstanding set of oppositely directed, axially spaced tang teethproviding a recess to receive an end of said brush strip member and tosecure said brush strip member on said core.
 9. In a rotary brushconstruction including a brush strip member wound in a helical path, thecombination of: a cylindrical core member formed out of a core blank;said core blank including integral sets of tang teeth formed thereinadjacent to ends of the blank, each set of tang teeth including teethformed inboardly of the other teeth of the set.